CN116043112A - 一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺 - Google Patents
一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺 Download PDFInfo
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Abstract
本发明公开了一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,该桥梁钢的化学成分组成按重量百分比为:C:0.06‑0.08%,Si:0.12‑0.45%,Mn:1.60‑1.70%,P≤0.020%,S≤0.010%,Nb:0.015%‑0.060%,Al:0.010%‑0.060%,Ti:0.008%‑0.020%,余量为Fe和不可避免的杂质。本发明所述的一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,粗轧阶段充分破碎奥氏体晶粒,精轧阶段保证累计压下率,充分保证奥氏体变形回复时间,辅以加速冷却,叠加细化晶粒,提高钢板低温韧性,可用于对钢板强度、低温韧性、抗震性能等均有一定要求的公路桥梁、铁路桥梁及公铁两用桥梁,适合应用在北方普遍环境及环境温度要求达到‑60℃及以上的北方极寒地区,可以确保安全使用寿命,提高使用安全性,具有良好的前景。
Description
技术领域
本发明涉及钢铁冶金技术领域,特别涉及一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺。
背景技术
随着国家经济建设的发展,大型桥梁向大跨度、重载荷的方向飞跃发展,钢结构桥梁的应用比例越来越大。在北方极寒地区,气温会出现-60℃以下的极端天气,桥梁钢结构所使用的钢材需要在极低温度下具有良好的低温韧性;在极寒地区,桥梁钢需要满足强度、塑性、-60℃韧性以及低屈强比的抗震性等综合性能要求。
中国专利“一种低温韧性优异的460MPa级低焊接裂纹敏感性耐火钢及其生产方法”,专利申请号201910983370.4,其生产出的钢材适应不了极低温地区的恶劣气候条件。
专利申请号为201510907797.8的《一种抗震性耐候桥梁钢及其制造工艺》公开了一种抗震耐候桥梁钢的生产工艺,其生产的钢材的强度级别仅满足420MPa要求,且富余量较小,且其冲击韧性未明确-60℃指标;
专利申请号为200410061112.4的《针状组织高强度耐候钢及其生产方法》中公开了一种高强度耐候桥梁钢的生产工艺,其生产的钢材强度级别仅满足420MPa要求,且其冲击韧性未明确-60℃指标;其屈强比≥0.85,未能保证钢板的抗震性能,无法满足当前桥梁钢的设计要求。
发明内容
本发明的主要目的在于提供一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,可以有效解决背景技术中的问题。
为实现上述目的,本发明采取的技术方案为:
一种适应极寒地区抗震性能500MPa级桥梁钢,该桥梁钢的化学成分组成按重量百分比为:C:0.06-0.08%,S i:0.12-0.45%,Mn:1.60-1.70%,P≤0.020%,S≤0.010%,Nb:0.015%-0.060%,Al:0.010%-0.060%,T i:0.008%-0.020%,余量为Fe和不可避免的杂质。
优选的,一种适应极寒地区抗震性能500MPa级桥梁钢,该桥梁钢的化学成分组成按重量百分比为:C:0.065%,S i:0.25%,Mn:1.67%,P:0.010%,S:0.001%,Nb:0.055%,Al:0.038%,T i:0.015%,余量为Fe和不可避免杂质。
优选的,一种适应极寒地区抗震性能500MPa级桥梁钢,该桥梁钢的屈服强度≥500MPa,抗拉强度≥630MPa,等比例伸长率A≥18%,-60℃纵向冲击功≥200J。
优选的,一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,包括以下工序:
(1)、铁水预处理;
(2)、顶底复吹转炉冶炼;
(3)、LF精炼;
(4)、VD/RH真空精炼;
(5)、宽板坯连铸;
(6)、炉卷轧制;
(7)、钢材控温。
优选的,工序(1)中的铁水预处理前铁水含S≥0.040%,铁水预处理时对铁水进行脱硫,脱硫后铁水含S≤0.010%。
优选的,工序(2)中顶底复吹转炉冶炼时顶底复吹转炉吹氧吹炼14-16mi n,顶底复吹转炉冶炼出钢时钢水中P≤0.015%,S≤0.010%和O≤0.06%。
优选的,工序(3)中和工序(4)中精炼处理后钢水中N≤0.0060%,O≤0.0030%,H≤0.0002%,LF精炼和VD/RH真空精炼为现有技术,因此,不过多描述。
优选的,工序(5)中宽板坯连铸采取全程保护浇注,宽板坯连铸过程中拉伸波动在±0.05m/mi n,结晶器钢液面波动在±3mm,钢水过热温度的波动范围为10-25℃。
优选的,工序(6)炉卷轧制包括以下步骤:
①、对铸造的板坯进行加热,加热温度为1200-1250℃;
②、再结晶区轧制温度区间为1000-1120℃;
③、未再结晶区轧制温度区间中精轧开轧温度为850-930℃;
④、精轧后采用加速冷却,终冷温度为300-500℃。
优选的,步骤②中再结晶区轧制道次压下率≥15%,再结晶区轧制总压下率≥40%,步骤③中未再结晶区轧制总压下率≥60%,终轧温度区间为720-840℃。
与现有技术相比,本发明一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,具有如下有益效果:
本发明一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,通过成分设计、转炉冶炼、精炼、连铸加热、轧制、冷却工艺控制,粗轧阶段充分破碎奥氏体晶粒,精轧阶段保证累计压下率,充分保证奥氏体变形回复时间,辅以加速冷却,叠加细化晶粒,提高钢板低温韧性,可用于对钢板强度、低温韧性、抗震性能等均有一定要求的公路桥梁、铁路桥梁及公铁两用桥梁,适合应用在北方普遍环境及环境温度要求达到-60℃及以上的北方极寒地区,可以确保安全使用寿命,提高使用安全性,具有较高的推广意义。
附图说明
图1为本发明一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺的流程图。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明。
实施例1
一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,包括以下工序:
(1)、铁水预处理;
铁水预处理前铁水含S≥0.040%,铁水预处理时对铁水进行脱硫,脱硫后铁水含S≤0.010%。
(2)、顶底复吹转炉冶炼;
顶底复吹转炉冶炼时顶底复吹转炉吹氧吹炼15mi n,顶底复吹转炉冶炼出钢时钢水中P≤0.015%,S≤0.010%和O≤0.06%.
(3)、LF精炼;
(4)、VD/RH真空精炼;
精炼处理后钢水中N≤0.0060%,O≤0.0030%,H≤0.0002%,精炼处理钢水温度和成分满足连铸和目标成分要求。
(5)、宽板坯连铸;
宽板坯连铸采取全程保护浇注,宽板坯连铸过程中拉伸波动在±0.05m/mi n,结晶器钢液面波动在±3mm,钢水过热温度的波动范围为10-25℃
(6)、炉卷轧制;
炉卷轧制的工艺制度如下表所示:
炉卷轧制时板坯再加热温度为1220℃,在炉时间130mi n,均热时间30mi n,再结晶区开轧温度为107℃,再结晶区终轧温度为1021℃,再结晶区轧制道次压下率≥15%,再结晶区轧制总压下率为42%;未再结晶区开轧温度为890℃,未再结晶区终轧温度为770℃,未再结晶区轧制总压下率为65%;终冷温度为420℃。
按照本实施例的步骤生产的一种适应极寒地区抗震性能500MPa级桥梁钢,该桥梁钢的化学成分组成按重量百分比为:C:0.070%,S i:0.26%,Mn:1.65%,P:0.010%,S:0.002%,A l:0.026%,Nb:0.052%,T i:0.017%,N:0.0055%,Pcm:0.19,余量为Fe和不可避免杂质。
该桥梁钢的性能指标如下表所示:
由上表可以看出,本实施例生产出来的500MPa级桥梁钢能满足低温极寒地区-60℃使用要求,且屈强比低具有抗震性能。
实施例2
一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,包括以下工序:
(1)、铁水预处理;
铁水预处理前铁水含S≥0.040%,铁水预处理时对铁水进行脱硫,脱硫后铁水含S≤0.010%。
(3)、顶底复吹转炉冶炼;
顶底复吹转炉冶炼时顶底复吹转炉吹氧吹炼15mi n,顶底复吹转炉冶炼出钢时钢水中P≤0.015%,S≤0.010%和O≤0.06%.
(3)、LF精炼;
(4)、VD/RH真空精炼;
精炼处理后钢水中N≤0.0060%,O≤0.0030%,H≤0.0002%,精炼处理钢水温度和成分满足连铸和目标成分要求。
(5)、宽板坯连铸;
宽板坯连铸采取全程保护浇注,宽板坯连铸过程中拉伸波动在±0.05m/mi n,结晶器钢液面波动在±3mm,钢水过热温度的波动范围为10-25℃
(6)、炉卷轧制;
炉卷轧制的工艺制度如下表所示:
炉卷轧制时板坯再加热温度为1205℃,在炉时间135mi n,均热时间30mi n,再结晶区开轧温度为1080℃,再结晶区终轧温度为990℃,再结晶区轧制道次压下率≥15%,再结晶区轧制总压下率为58%;未再结晶区开轧温度为918℃,未再结晶区终轧温度为770℃,终冷温度为435℃。
按照本实施例的步骤生产的一种适应极寒地区抗震性能500MPa级桥梁钢,该桥梁钢的化学成分组成按重量百分比为:C:0.065%,S i:0.25%,Mn:1.67%,P:0.010%,S:0.001%,A l:0.038%,Nb:0.055%,T i:0.015%,N:0.0045%,Cr:0.52%,Pcm:0.19,余量为Fe和不可避免杂质。
该桥梁钢的性能指标如下表所示:
由上表可以看出,本实施例生产出来的500MPa级桥梁钢能满足低温极寒地区-60℃使用要求,且屈强比低具有抗震性能。
采用上述组分及重量百分比含量制造的所述适应极寒地区高韧性Q500q,所述桥梁钢的厚度规格为10-50mm,所述桥梁钢的屈服强度ReL为500-600MPa,抗拉强度Rm为630-730MPa,屈强比≤0.84,-60℃低温冲击韧性≥200J。
需要说明的是,本发明一种适应极寒地区抗震性能500MPa级桥梁钢及其制备工艺,通过成分设计、转炉冶炼、精炼、连铸加热、轧制、冷却工艺控制,粗轧阶段充分破碎奥氏体晶粒,精轧阶段保证累计压下率,充分保证奥氏体变形回复时间,辅以加速冷却,叠加细化晶粒,提高钢板低温韧性,可用于对钢板强度、低温韧性、抗震性能等均有一定要求的公路桥梁、铁路桥梁及公铁两用桥梁,适合应用在北方普遍环境及环境温度要求达到-60℃及以上的北方极寒地区,可以确保安全使用寿命,提高使用安全性,具有较高的推广意义。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其效物界定。
Claims (10)
1.一种适应极寒地区抗震性能500MPa级桥梁钢,其特征在于,该桥梁钢的化学成分组成按重量百分比为:C:0.06-0.08%,Si:0.12-0.45%,Mn:1.60-1.70%,P≤0.020%,S≤0.010%,Nb:0.015%-0.060%,Al:0.010%-0.060%,Ti:0.008%-0.020%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的一种适应极寒地区抗震性能500MPa级桥梁钢,其特征在于:该桥梁钢的化学成分组成按重量百分比为:C:0.065%,Si:0.25%,Mn:1.67%,P:0.010%,S:0.001%,Nb:0.055%,Al:0.038%,Ti:0.015%,余量为Fe和不可避免杂质。
3.根据权利要求1所述的一种适应极寒地区抗震性能500MPa级桥梁钢,其特征在于:该桥梁钢的屈服强度≥500MPa,抗拉强度≥630MPa,等比例伸长率A≥18%,-60℃纵向冲击功≥200J。
4.根据权利要求1-3任一所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于,包括以下工序:
(1)、铁水预处理;
(2)、顶底复吹转炉冶炼;
(3)、LF精炼;
(4)、VD/RH真空精炼;
(5)、宽板坯连铸;
(6)、炉卷轧制;
(7)、钢材控温。
5.根据权利要求4所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:工序(1)中的铁水预处理前铁水含S≥0.040%,铁水预处理时对铁水进行脱硫,脱硫后铁水含S≤0.010%。
6.根据权利要求4所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:工序(2)中顶底复吹转炉冶炼时顶底复吹转炉吹氧吹炼14-16min,顶底复吹转炉冶炼出钢时钢水中P≤0.015%,S≤0.010%和O≤0.06%。
7.根据权利要求4所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:工序(3)中和工序(4)中精炼处理后钢水中N≤0.0060%,O≤0.0030%,H≤0.0002%。
8.根据权利要求4所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:工序(5)中宽板坯连铸采取全程保护浇注,宽板坯连铸过程中拉伸波动在±0.05m/min,结晶器钢液面波动在±3mm,钢水过热温度的波动范围为10-25℃。
9.根据权利要求4所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:工序(6)炉卷轧制包括以下步骤:
①、对铸造的板坯进行加热,加热温度为1200-1250℃;
②、再结晶区轧制温度区间为1000-1120℃;
③、未再结晶区轧制温度区间中精轧开轧温度为850-930℃;
④、精轧后采用加速冷却,终冷温度为300-500℃。
10.根据权利要求9所述的一种适应极寒地区抗震性能500MPa级桥梁钢的制备工艺,其特征在于:步骤②中再结晶区轧制道次压下率≥15%,再结晶区轧制总压下率≥40%,步骤③中未再结晶区轧制总压下率≥60%,终轧温度区间为720-840℃。
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